article: Tom, Bill and Dave lost their backpacks. They are at the lost and found case. The backpacks are the same  , but the things in them are different. Can you help them find the right  backpack?
  Tom: I have a math book and a pencil case in my backpack. There are three pencils, a pen and an eraser in the pencil case.
  Bill: I have a Chinese dictionary, a math book and two notebooks in my backpack.
  Dave: There are two CDs, three picture books in my backpack. My English book is also in it.
question: _  is/are not in Dave's backpack.
options: Two CDs Three pencils Three picture books An English book